<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="app">
        <input type="text" v-model="val">
        <button @click="addItem">添加</button>
        <div>
            <h2>
                正在进行---{{len}}
            </h2>
            <ul>
                <li v-for="(item,index) in arr" v-show="!item.checked">
                    <input type="checkbox" v-model="item.checked">
                    {{item.val}}
                    <button @click="del(item)">删除</button>
                </li>
            </ul>
            <h2>
                已经完成---{{arr.length-len}}
            </h2>
            <ul>
                <li v-for="(item,index) in arr" v-show="item.checked">
                    <input type="checkbox" v-model="item.checked">
                    {{item.val}}
                    <button @click="del(item)">删除</button>
                </li>
            </ul>
        </div>
    </div>
    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
    <script>
        new Vue({
            el:'#app',
            data:{
                // input输入的值
                val:"",
                // 总的任务
                arr:[],
            },
            // 计算属性
            computed:{
                len(){
                    return this.arr.filter((item)=>{
                        return item.checked===false
                    }).length
                }
            },
            methods:{
                addItem(){
                    this.arr.push({
                        val:this.val,
                        checked:false
                    })
                    this.val=""
                },
                del(item){
                    this.arr.splice(this.arr.indexOf(item),1);
                },
     
            }
        })
    </script>
</body>
</html>